With son Riley, third- and fourth-generation heads of engineering juggernaut that built the Hoover Dam, Trans-Alaska Pipeline and Channel Tunnel. Revenues now exceed $18 billion; rapid growth recently with large rebuilding contracts in Iraq. Father and son believed to own 20% of company each. Recent high-profile projects include Washington State's Tacoma Narrows Bridge, building emergency housing in Louisiana after Katrina. Also erected China's largest petrochemical plant, natural gas facilities in Australia and Africa. Riley now chairman, CEO.

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